OpenEdge Data Management: DataServer for Microsoft SQL Server

Enhancements overview
For installations where the number of ODBC connections is limited, you might decide to
enable only the DataServer connection management. For deployments in which memory
constraints are a concern, enabling only the ODBC connection pool provides on-demand
connections, with optimized resource efficiency. If both an ODBC connection pool and
managed connections coexist in the same DataServer process, the managed connections
will come from the ODBC connection pool. The managed connections are distinguished
from the connection pool connections in that they are never released back to the pool for
the life of an ABL session.
Considerations when using ODBC connection pooling and DataServer
connection management
When both ODBC connection pooling and DataServer connection management are enabled, set
the number of managed connections to a value that covers the required number of connections
for a typical application. Reuse of the managed connections takes precedence over ODBC
connection pool connections. The ODBC connection pool is then an overflow handler for
connections required beyond the capacity of the managed connections. This configuration
ensures that there is little risk of having a negative impact on performance by downgrading to a
Fast Forward-Only server-side cursor in the mainline transaction-oriented connection. For more
information on monitoring the performance of your connection pool, see the “Monitoring cursor
and connection use” section on page 4–6.
ODBC Connection Pooling
ODBC connection pooling is managed by the ODBC driver manager, external to the
DataServer. The size of the pool grows and contracts dynamically based on demand and
time-out intervals. The upper limit to the pool size is limited only by memory and other server
resource constraints. The DataServer retrieves connections out of the externally managed pool.
ODBC connection pooling is maintained with the CONNECTION_POOLING option to the -Dsrv
connection parameter. ODBC connection pooling is enabled by default.
Disable ODBC connection pooling with the following syntax:
Syntax
-Dsrv CONNECTION_POOLING,0
Note: To take advantage of ODBC connection pooling in the DataServer, you must rebuild
your schema holder. However, if your schema holder was built before OpenEdge
Version 10.0B, contact Technical Support for information about how to proceed.
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